Revision as of 17:10, 16 June 2009

The Neo Freerunner (GTA02) inherited the audio subsystem from its older brother the Neo 1973 (GTA01). However, there are a few small differences.
This page tries to show and explain the differences and points you to the Neo 1973 page whenever it touches the common points (but there may be overlaps for the sake of usability). As wiki pages are, errors and omissions are likely, and your help is welcomed.

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Differences from Neo 1973

There is only 1 (mono) built-in loud speaker (connected to LOUT1) instead of 2 (stereo).

The Wolfson Codec driver presents 94 separate controls {switches, multiplexers, and volumes} to the alsa system (in both Neos). Unfortunately they are not mapped exactly the same for the GTA01 as for the GTA02.

for mic the (full, true) procedure is as follows:
reduce #5 by some 15..30 steps
do testcall:
you get very low volume at far end. but tone should be clear, no clipping (sharp agressive noise)
if there is clipping: reduce #48 by one step (i.e. to "2")
then adjust #5 to your preferences and taste
(do `alsactrl store -f gsmhandset.state` to save the changes if you used a mixer to adjust the levels)

for speaker (earpiece):

level up modem to full volume,
level up #6 to full volume,
adjust by #4
if you get clipping when #4 is at moderate level (same as above): reduce #6 until clipping vanishes
(very unlikely to occur for earpiece playback)

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The Neo Freerunner (GTA02) inherited the audio subsystem from its older brother the Neo 1973 (GTA01). However, there are a few small differences.
This page tries to show and explain the differences and points you to the Neo 1973 page whenever it touches the common points (but there may be overlaps for the sake of usability). As wiki pages are, errors and omissions are likely, and your help is welcomed.

Differences from Neo 1973

There is only 1 (mono) built-in loud speaker (connected to LOUT1) instead of 2 (stereo).

The Wolfson Codec driver presents 94 separate controls {switches, multiplexers, and volumes} to the alsa system (in both Neos). Unfortunately they are not mapped exactly the same for the GTA01 as for the GTA02.

for mic the (full, true) procedure is as follows:
reduce #5 by some 15..30 steps
do testcall:
you get very low volume at far end. but tone should be clear, no clipping (sharp agressive noise)
if there is clipping: reduce #48 by one step (i.e. to "2")
then adjust #5 to your preferences and taste
(do `alsactrl store -f gsmhandset.state` to save the changes if you used a mixer to adjust the levels)

for speaker (earpiece):

level up modem to full volume,
level up #6 to full volume,
adjust by #4
if you get clipping when #4 is at moderate level (same as above): reduce #6 until clipping vanishes
(very unlikely to occur for earpiece playback)